The excessively high proportion ammonium nitrogen does not avail the enhancement of tobacco leaf mean price, it is highest if matched by 75% nitric nitrogen and 25% ammonium nitrogen;
过高的比例施用铵态氮不利于烤烟均价的提高，以75％的硝态氮和25％铵态氮配施烤烟均价最高；
Water vapor in the air combines with nitrogen and forms nitric acid.
水汽在空气中用氮和表格氮的酸联合。
OCO is a kind of new biochemical process. It has the function of nitrogen and phosphorus removals and realizes the automatic returns of nitric liquid, so it is economical of energy.
OCO是一种新型的生化反应器，具有较强的脱氮除磷功能，可实现硝态液的自动回流，节约能耗。
A modern YZ-1 type inhibitor of nitric oxides is investigated, which can be used for brass articles in bright acid dipping to inhibit formation of nitrogen oxides.
本文介绍了一种新型的YZ - 1型氮氧化物抑制剂，可用于铜件酸洗抛光时抑制氮氧化物的生成。
The method for removing nitrogen oxides in the effluent gas from manufacturing nitric acid by using acidic urea solution as an absorbent to absorb the nitrogen oxides is introduced.
介绍用酸性尿素溶液作吸收剂，吸收硝酸尾气中氮氧化物的净化方法。
The method for removing nitrogen oxides in the effluent gas from manufacturing nitric acid by using acidic urea solution as an absorbent to absorb the nitrogen oxides is introduced.
介绍用酸性尿素溶液作吸收剂，吸收硝酸尾气中氮氧化物的净化方法。
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